As I think more about it, frankly I'd want to call it C1. It does technically require placing gear, which I found to be a lot harder to place than just setting pro in a straightforward crack (that lasso is tricky!). Also, unless you get it just perfect, it really doesn't seem that secure. Finally, people then do ascend the rope via pre-tied knots or prussics rather than pulling for one move. So really, while it doesn't involve the placement of traditional gear, based on the general spirit/idea of the given rating, wouldn't you say the Thunderbolt summit block is C1 and not C0/A0? It's not really equivalent to swinging off a rappel or using a bolt ladder. Especially if reading the classification from here strictly?
Aid climbers - thoughts?